Draft-regulating apparatus for furnaces of stationary boilers.



Patented Aug. 27, |90I.

i C. POLIG &, J. ZIMMERMANN. DRAFT BEGULATING APPARATUS FUR FURNACES 0FSTATIUNABY BGILEBS.

(Aiaylinatinn led June 4, 1900.)

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(No lModel.)

g i UNiTi-:DN STATES" PATENT @ii-rient CHARLES POLIG AND'JOHANNZIMMERMANN, OF VIENNA, AUSTRIA-HUN- GARY, ASSIGNORS TOACTIEN-GESELLSCHAFT ZUR VERWERTHUNG DER OSTERR. UND UNGAR. PATENTE TH.LANGER, OF SAME PLACE.

DRAFT-REGULATING APPARATUS FOR `FURNACESOF STATIONARY `BOILERS.

SPECIFICATION forming part of Letters Patent No. 681,259, dated August27, 1901.

` Application had rune-i, 1900.

` in the Province of Lower Austria, in the Empire of Austria-Hungary,have invented oerp tain new and useful Improvements in Draft- RegulatingApparatus for the Furnaces of Stationary Boilers; and we do herebydeclare the4 following to be a full, clear, and exact description of theinvention, such as will enable others skilled inthe art to whichitapperf; i l tains to make and use the same, reference bet l `ing hadto the accompanying drawings, and .i I5

to letters and Iigures of reference marked thereon, which form a part ofthis specification. This invention relates to apparatus adapt- ;ed toregulate automatically the draft in the i thethickness of the layer offuel on the Iirebars `by operating the damper and the fire- `door iap orair valve in a suitable manner,

smokeless ring. i

The mode of `operation of the apparatus according to this invention isas follows: When the fire-door is closed, (after stoking,) the f damperand the tire-door air-flap are opened. The damper immediately begins toclose, at first slowly,`but later with greater velocity,and

` before it reaches its `lowest position the airt iiap on the tiredooris also automatically p closed. These parts are operatedbysteampressure, and the work to be done by the refinan :is thereforereduced to a minimum. Such apparatus comprises astealn-cylinder(hereinafter called the working cylinder) whose piston is connected to apulley that operates the damper, to the piston of a i brake-cylinder,andto a piston-valve that controls the movement otvan air-flap, and adisftributer whichl is vactuated by the re-door l and :is operated bysteam-pressure and which whenthe fire-door is closed allows steam to i`flow under the piston of the before-mentioned vworking cylinder toenable the latter to open thedamper and also the air-flap by means of a`piston valve and `an auxiliary cylinder `furnaces of stationary boilersaccording to` so as to fulfil the necessary conditions for` l N251Serial No. 19,016. (No model.)

whose piston is operated thereby. When the piston of the workingcylinder reaches its highest position, it effects the reversing movementof the distributer, which places the lower end of the said workingcylinder into communication with the exhaust, so that the piston candescend, and thereby gradually closes the damper. ment of the piston andthe damper is retarded by the piston of a brake-cylinder. Before thepiston of the working cylinder reaches its lowest position thesteam-supply to the auxiliary cylinder, that holds the air-Hap open, isshut off, thereby causing the air-flap to closequickly under theinfluence of its own weight and of a spring. The minimum opening of thedamper can be adjusted according to the rate of working.

Apparatus according to this invention is shown in the accompanyingdrawings, :in which- Figure l is a front elevation, partlyin section, ofsuch a draft-regulator with the firedoor. Fig. 2 shows in horizontalsection the apparatus that transmits the movement of the piston of theworking cylinder to the damper and enables the adjustment of the minimumopening of the damper to be effected.

bolt h and carries a disk d, that is provided with a cam portion c forraising thepiston e of the steam-distributer f when the tire-door isopened.

tire-door a on trunnions, one of which carries a short arm 7L, connectedto the piston la of an auxiliary cylinder Z by means ot' a chainjrunning over a pulley The auxiliary cylinder Z contains a spring fm,continually pressing the piston 7c toward the right, and communicatesthrough a pipe n with the .steaminlet and through a pipe o with theexhaust.

The steam-distributer f com prises a cylinder ton e. The space abovethediiterential piston p communicates through a pipe q with the middleportion of the working cylinder 1" and through passages s with the spacebelow `the piston e and the space between the two The downward movea isa fire-door which swings on ahinge-v g is an air-Hap mounted to swing ontheV containing a differential piston p and the pisparts of thedierential piston p. The distributer-cylinder, which is formed with apassage t, communicating with the exhaust-pipe, is in communicationthrough a pipe u with the lower end of the cylinder fu and through thiscylinder with the steam-inlet w. The distributer cylinder alsocommunicates through two passages y at diderent levels with the pipe e,leading to the lower end of the working cylinder r, which contains apiston 1, connected to a pulley 4: by means of a rod 2 and achain 3, thepulleyabeing coupled to a pulley 5, around which there passes a chain 6,leading to the damper. The movement of the piston 1 is transmittedthrough the rod 2 and double-arm lever 7 to the piston 8 of abrake-cylinder 9, which is filled with liquid,such as oil or glycerin.The piston 8 is formed with a valve 10, which opens on the downstroke ofthe piston and permits the liquid to pass from the space below the saidpiston tothe space thereabove, these two chambers being in communicationwith each other by a passage 11, which communicates with the middleportion of the cylinder by a passage 14. A cock 12, with a wide aperture13, is located in the passage 11 above the passage 14, and below thepassage 14 there is arranged a cock12' with a narrow aperture 15. Bothcocks are formed like screws with fine threads, so as to enable theareas of the apertures to be exactly regulated. The end of a one-armlever 16 engages with the rod of the piston 8 for the purpose of movingapiston 20 (which is located in the cylinder o and is provided withaxial passages 19) against the action of a spring 21 by means of anadjustable cam 18, mountedV on an axle 17.

The action of the apparatus is the following: When the fire-door aisopened, the projection c on the disk d raises the piston e, which closesthe passage y and raises the differential piston p until steam can flowthrough the passage u below the differential piston p and force the saidpiston upwardly, so as completely to open the passage u and close thepassage When the re-door is open, the damper remains in its lowestposition,as steam is prevented from dowing under the piston 1, since thepiston @covers the passage y. Now when the fire-door d is closed afterstoking the piston e is lowered by the steam-pressure acting upon it anduncovers the passage fy, through which the steam can then flow into thepipe z to the lower end of the working cylinder r, so as to raise thepiston 1 and cause the damper to open, the piston 8 of the liquid-braketo descend and the eccentric 18 to force down the piston 20 in thecylinder 12, so that the steam can flow from the pipe w through thepassage 19 in the piston 2O and the pipe n into the auxiliary cylinderl,so as to move the piston 7c to the left and open the air-flap g, whichremains open as long as the piston lo is under steam-pressure. When thepiston 1 uncovers the passage q,(t'. e., after the damper has beenraised,)

the steam flows through the pipe q into the distributer f and againforces down the differential piston p into the position shown, thusclosing the passage u and opening the passage w, and thereby enablingthe steam under the piston 1 to pass out through the pipe z, thepassage, and the pipe t. The piston 1 would then descend quickly, andwith it the damper, if this were not prevented by the piston 8, which iscontained in the brakecylinder 9 and cannot move upwardly faster than ispermitted by the liquid flowing through the passage 11 and the narrowaperture 15. The upward movement of the piston 8 is therefore at firstvery slow, and the speed increases only after the lower edge of thepiston 8 has uncovered the passage 14:, which renders a larger areaavailable for the overflow of the liquid, so that the damper can closeslowly at irst and afterward` more quickly. Before the piston 1 and thedamper have reached their lowest positions the piston 20, pressedupwardly by the spring 21, closes the passagen and shuts off the steamypressure in the auxiliary cylinder Z, whose piston 7c is then forced tothe right by the spring m, so that the air-flap g can close by its ownweight. The damper must never close the ue completely, as otherwise theproducts of combustion would escape through the lire-door into theStoke-hole. Now it is necessary to alter the minimum opening of thedamper during the several periods of working, and to effect this thepulley 6, to which the chain 6, leading to the damper, is secured, isloosely mounted on the pin 22, while the pulley 4 and the disk 23 arekeyed to the said pin. The pulley 5 has an annular series of holes 24and can be coupled to the disk 23 by means of a pin 25. If, forexample,the minimum opening of the damper requires to be increased,(which is necessaryl in forced workng,) the pin 25 is withdrawn from thedisk 23 and the pulley 6 when the piston 1 is in its lowest position,and the pulley is turned by means of its handle 26, so that the damperis raised, whereupon the disk 23 and the pulley 5 are again coupledtogether by means of the pin 25. The time required for the descent ofthe damper can be exactly regulated by means of 'the regulating-screwsthat constrict the area of the overIiow-passages 11 and 13 of thebrake-cylinder 9. The time during which the steam.- supply to the pipe nis interrupted, whereby the closing of the air-[lap g is effected, canbe altered at will by suitably adjusting the eccentric 18 on the shaft17. The eccentric 18 can even be so adjusted that the air-flap does notopen at all.

We clai1n- 1. In a draft-regulator, a steam-distributer set in operationby the furnace-door, a steamcylinder steam-connected to the distributer,a piston in said cylinder arranged to operate a damper, means forbraking the steam-piston after steam-supply thereto has been cut IIO o,said distributor arranged to cut off the steam-supply tothesteam-cylinder when its stantially as set forth.

2. In a draft-regulator, a steamdistributer set in operation by thefurnace-door, a steamcylinder steam-connected to said distributer y atone end, a second steam connection from the steam-cylinder to thedistribu ter arranged to be opened when the steam-piston hasaccomplished part of its travel, a brake-cylinder,its piston, a/pivotedlever connected at one end to the steam-piston and at the other p y tothe brake-piston,and a damper operated by i the steam-piston,substantially as set forth.

3. In a draft-regulator, a steam-distributer l l" and` differentialpiston-valve operatively lo- "cated therein to cut off the steam-supply,means operated from the furnace to displace steam .i connection betweenone end thereof and the steam-distributer at a point below thedifferential valve, and a steam connection between said cylinderintermediate its above the differential valve and a damper lpiston-valve thereincomprising two conthe differential valve, asteam-cylinder, a

ends and the steam-distributer at a point operated by the steam-piston,substantially las set forth.V

` 4. In a draft-regulator, a steam-distributer comprising a suitablecasinga differential znected pistons of different sizes, one of themcontrolling a steam-inlet port, a pistonin said casing arranged todisplace the differential fvalve, a steam by-pass connecting both endsof the casingand abranch passage connectl i Iing the by-pass with theinterior ofthe casl -ying intermediate the pistons of the differentialvalve and arranged to be closed by one 4e `I i der and its 'pistonsteam-supplied through the of them; in combination with a steam-cylin- Rdistributer, and a steam connection from said y `steam-cylinder to thedifferential valve, suby stantially as set forth. 45

5. In a draft-regulator, a steam-distributer i. .l comprising a suitablecasing, a differential piston -valve therein comprising two conw nectedpistons lof different sizes, one of them controlling a steam-inlet port,a piston arl ranged to start the opening ofthe diiferential f1 valve, asteam by-pass connecting the top and `bottom of said casing, asteam-chamber, passages connecting it with `the interiorof the k casingabove and below one of the pistons of the differential valve, anexhaust, said eX- `haust and `one of the passagesbetween the iIsteam-chamber and interior of the casing "capable of being closed bythe differential tially as set forth.

y 6. In a draft-regulator, a steam-distributer,

l "l valve, and steam inlets and outlets7 substan- 6o l a steam-cylindersupplied therefrom, and provided with a steam-outlet intermediate itsends, a piston and rod, a damper operatively connected to one end ofsaid rod and a brakey cylinder, its.` piston and rod, a pivoted leverconnecting the rods of the brake and steam pistons, a steam-cut-offvalve, a tappet to operate said valve actuated by the brake piston-rod,substantially as set forth.

7. In a draft-regulator, a steam-distributer, a steam-piston containedwithin a steam-circuit from and to the distributer, a piston and rod inthe cylinder operatively connected to a damper, a brake-cylinder adaptedto contain a liquid, a piston provided with a valve normally closed whenbraking, its piston-rod, the steam and brake piston-rods opera-tivelyconnected, a by-pass connecting the ends of the brake-cylinder, saidby-pass having constricted passages near its ends one smaller than theother, and a passage intermediate the constricted portions tocommunicate with the interior of the brake-cylinder arranged to beclosed by the brake-piston when near the limit of its braking stroke,substantially as set forth.

8. In a draft-regulator, a steam-distributer, a steam-piston containedwithin a steam-,circuit from and to the distributer, a piston and itsrod in the cylinder operatively connected to a damper, a brake-cylinderadapted to contain a liquid, a piston provided with a valve normallyclosed when braking, its piston-rod,

a pivoted leverA connecting the ends of the steam and brake piston-rods,ahy-pass connecting the ends of the brake-cylinder, means near the endsof the by-pass for constricting and regulating the degree ofconstricture in said by-pass, the free passage being smaller nearthe endof the braking stroke, a port intermediate the constricted portions ofthe bypass communicating with the interior of the cylinder arranged tobe closed by the braking piston when near the limit of its brakingstroke, substantially as set forth.

9. In a draft-regulator, the combination with a furnace-door flap,anactuating device comprising a steam-cylinder, a spring-re tracted pistontherein and its piston-rod operatively connected to actuate thefurnacedoor flap; of a spring-retained steam-cut-off valve, asteam-distributer connected theiieto and steam-actuated devices suppliedfrom the distributer for actuating the steam-cutoff valve, substantiallyas set forth.

lO. In a draft-regulator, the combination with a furnace-door, a iiapmounted on trun# nions thereon, a steam-cylinder, a spring-retractedpiston and rod therein, said rod op'- eratively connected to the flap;of a springretained steam-cut-off valve, a steam-distributer, asteam-actuated piston arranged to actuate a damper, a braking-pistoncon-v nected to the steam-actuated piston, a cam, its actuating-leveroperated by the brakingpiston to operate the steam-cut-off valve,substantially as set forth.

1l. In a draft-regulator, the combination with a steam-cylinder, itspiston and rod and means for supplying steam to said cylinder, a pulley,a flexible connection between the `pulley and rod, a pulley providedwith a handle connected to a damper, a spindle fixed IOO IIO

thereto, the irst-mentioned pulley loose on said spindle and means foradj usting and connecting the loose pulley to the one voperating thedam-per, thereby adjusting the degree of closure of the latter,substantially as set forth.

12'. In a draft-regulator, the combination with afurnace-door and a rod,a cam carried thereby; of a steam-distributer comprising a suitablecasing, a differential valve therein 1 `our inventionwe have signed ournames in consisting of two connected pistons of different sizes, apiston and its rod below the differential valve arranged to be cammed'by the cam on the furnace-door to start the dif- I ferential valve, asteam by-pass connecting chamber and two ports connecting it with theValve-chamber, an exhaust-portintermediate the pistons of said valve,one of thepistons of the Valve arranged to control the exhaustport, oneof the port-s to the Asteam-chamber and the one to the by-pass, and asteam piston and cylinder to actuate a damper operatively included in asteam-circuit from and to the distributer, substantially as set forth.

In testimony that We claim the foregoing as presence of two subscribingWitnesses.

GU'sTAV PHILIPPITICH, ALVEsTo S; HOGUE.-

